Between 2014 and 2017, almost 200 new seismic stations were installed in Alaska and northwestern Canada as part of the EarthScope USArray Transportable Array. These stations currently provide an unprecedented capability for the detection and location of seismic events in regions with otherwise relatively sparse station coverage. Two interesting earthquake sequences in 2018 and 2019 in the northeastern Brooks Range were exceptionally well recorded because of this deployment. First is the aftershock sequence of the Mw 6.4 and Mw 6.0 Kaktovik earthquakes of 12 August 2018, the largest earthquakes recorded to date in the region. The second is the Niviak swarm, southwest of the Kaktovik sequence. Since July 2018, >4000 earthquakes between magnitudes 1 and 4.3 have been recorded across a region exceeding 5000 km2⁠. We explore how the Bayesloc probabilistic multiple seismic‐event location algorithm can better resolve features of these two sequences, exploiting the large numbers of readings that the improved station coverage provides from events down to magnitudes below 2. The Bayesloc calculations consistently move events in the Kaktovik sequence a few kilometers to the northeast, providing an almost linear east‐southeast‐striking southern limit to the aftershock zone. Analysis of the Bayesloc joint probability distribution of corrections to travel‐time predictions indicate that anomalously fast wave propagation to the southwest is likely the most significant contribution to the seismic‐event mislocation. The joint relocations are more consistent with Interferometric Synthetic Aperture Radar–inferred coseismic displacement than the network location estimates. The Bayesloc relocation of the Niviak events confirms that the earthquakes are distributed between many distinct clusters of seismicity that have clearer spatial separation following the relocation. The probabilistic relocations motivate both double‐difference studies to better resolve clustered seismicity at the smallest spatial scales and systematic multiple event relocation studies to calculate structure and travel‐time corrections over larger scales.

中文翻译：

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使用可移动阵列和概率定位方法解决阿拉斯加北部地震序列

在2014年至2017年之间，作为EarthScope USArray可移动阵列的一部分，在阿拉斯加和加拿大西北部安装了近200个新的地震台站。这些站目前提供了前所未有的能力来检测和定位地震覆盖范围相对稀疏的区域中的地震事件。由于这种部署，在布鲁克斯山脉东北部2018年和2019年发生了两次有趣的地震序列，异常记录。首先是2018年8月12日的卡托维克6.4级和6.0级地震的余震序列，这是该地区迄今为止记录的最大地震。第二个是在Kaktovik序列西南的Niviak群。自2018年7月以来，在超过5000 km2的区域记录了超过4000次1级至4.3级地震。我们将探索Bayesloc概率多地震事件定位算法如何更好地解析这两个序列的特征，并利用改进的台站覆盖范围（从事件降到2以下）提供的大量读数。Bayesloc计算始终如一地在Kaktovik中移动事件序列向东北延伸几公里，为余震区提供了一个几乎呈线性的东南偏南的界限。对对行进时间预测的校正的贝叶斯洛克联合概率分布的分析表明，异常快波传播到西南地区可能是地震事件错位的最重要因素。与网络位置估计相比，关节重定位与干涉合成孔径雷达推断的同震位移更一致。Niviak事件的Bayesloc搬迁证实了地震分布在许多不同的地震活动群之间，这些集群在搬迁后具有更清晰的空间间隔。概率重定位既可以促使双差研究更好地解决最小空间尺度上的聚类地震活动，也可以激发系统的多事件重定位研究，从而在较大尺度上计算结构和旅行时间校正。